Improvement in fire-proof shutters



SPL. POLLOOK. Fire- Proof Shutters.

No. 205,297. Pate r pted June 25, 1878.

illlllii El llllllllllllll .Illll Illlllllllllllflillli S mllw WITNESSES INVENTOR 1 1 my Kaye/we BY S Q l ATTORNEYS. Q

"- R FHGTO-LKTNDGRAPMER, WASHINGTON, D

UNITED STATES PATENT ,j OFFICE. v

SIMON L. POLLOOK, OF ST. PAUL, MINNESOTA.

IMPRO VEMENT IN FIRE-PROOF SHUTTERS.

Specification forming part of Letters Patent No. 205,297, dated J unc 25, 1878; application filed May 3, 1878.

the construction of plain and corrugated iron shutters for doors and windows, in such a manner as to adapt them for utilizing the non- V conducting qualities of inclosed columns of air to the protectionof property against fire.

The invention consists in a fire-proof shutter formed of the combination of an interior and an exterior sheet-iron wall, separated from a central partition-wall by metallic cross-strips, and joined at the edges by flanges to form closed chambers for inclosin g air without admitting its circulation, as will be hereinafter described.

In the accompanying drawing, Figure 1 represents a horizontal or cross section, on the line 00 a; of Fig. 2, of my improved fire-proof shutter. Fig. 2 is an exterior side elevation of the same, parts being broken out. Fig. 3 is a vertical section taken on the line 3 3 of Fig. 2.

Similar letters of reference indicate correspondin g parts.

A is the outer andB the inner side of a window-shutter, both made of corrugated sheetiron, the interior plate B having its edges bent first at right angles to its main surface, to form a deep flange, b, and then again the edge of the flange b bent at right angles to the flange and parallel with the main surface, to form a flange, b, for bolting the interior plate B to the flange a of the exterior plate A.

O is a plain iron plate interposed between the plates A and B as a central partition, diridin g the space between them in about two equal-sized chambers, D and E, and having an edge flange, c, of about half the depth of and parallel with the flange b, and a flange, 0, parallel with and interposed between the flanges b and a, the latter being bent over and around the edges of the flanges c b, and the same rivets or bolts a fastening them all together.

The partition wall or plate 0 has a central crease made in it parallel with the corrugations of the other plates, as shown in the drawing, to allow for expansion by heat.

The central plate 0 is held separated from the plates A and B by series of curved or straight iron strips F G, which are provided with lugs f, and are fastened to the plate (3 by rivets through thesaid lugs.

The hinge-bolts H and several other bolts are made long enough to go through the two chambers D E from the outer to the inner sideof the shutter, to strengthen the latter and clamp the sheets A B O tightly against the edges of the strips F G, to keep the chamber-Walls at the proper distance apart, and prevent their collapsing by accidental extra strain.

The chambers D E are closed above and below by iron plates, the lower plate having an extension, I, in front of the exterior plate A, which extension or plate I may be bent down, if desired, to close tightly against the windowsill and prevent flames and water from entering under the shutter.

I do not limit myself to the corrugated iron plates and particular form of the shutter shown,

as the plates may be plain and the form varied without departing from my invention.

I am aware that it is not new to make a corrugated iron door or shutter of two or more sheets of corrugated metal, the corrugations at right angles to each other, and inclosed at their edges by channel-iron bars, while the parts are all bolted or riveted together.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent A fire-proof shutter consisting of the walls A B O, bolted together, the cross-strips F G, and the flanges (I b b c c, as shown and described.

SIMON LOGKE POLLOCK.

\Vitnesses WILLIAM Y. HORNE, D. L. KINesnUnY. 

